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Full text of "The manufacture and properties of iron and steel"

324
METALLURGY OP IRON AND STEEL.
a trifling amount in one, the average showing a decrease of 1114 pounds per square inch.
(2)   The elastic limit was lowered in three cases and raised in one, the average showing a decrease of 1454 pounds per square inch; the elastic ratio was reduced from 68.7 per cent, to 67.5 per cent.
(3)   The elongation was raised in every case, the average showing an increase of 0.55 per cent.
(4)   The reduction of area was lowered in three heats and raised in one, the average showing a decrease of 1.07 per cent.
The testimony of these records is corroborated by the data on the larger diameters. Only one heat is given on each of these sizes, but there were from twelve to sixteen bars in each case, and as the steel was of the same manufacture in all particulars the results may be accepted as comparable. It seems certain that larger bars will give a lower ultimate strength, a lower elastic limit, a
TABLE XVI-L. Effect of Changes in the Width of the Test-Piece.
	Thickness in inches.	No. of heats in av.	Width, of test-piece in inches.					
			8	2	IX	1	H	%
StuQin  p T3 H	|	2 8 8 2 10.	72510 72020 67045 73840 68111	73480 72220 68500 73550 68224	73840 72420 68710 . 74530 67060	78250 72643 68220 73870 67890	74420 71568 68060 78520 68338	75440 78681 68940 76180 67442
	" True av.	80	60784	70069	70176	69968	69872	70678
Elastic limit; pounds per square in.	f	2 8 8 2 10		41685 42485 41600 45840 45039	42185 42353 42190 46740 45346	41965 42711 41620 46086 45664	42975 42798 41630 46285 46676	46665 46058 46820 61820 45659
								
								
								
								
								
	True av.	80		43571	43588	48579	44023	46285
								
Elongation in 8 inches; per cent.	V TB	2 8 8 2 10	20.87 20.78 80.75 28.87 28.50	28.87 27.88 28.69 27.50 27.28	28.87 27.66 27.72 25.62 26.65	25.00 26.06 27.84 '    25.87 25.85	23.75 24.78 26.81 25.12 24.98	24.25 24.88 24.08 23.60 22.98
	True av.	80	20.52	27.92	27.25	26.25	25.21	28.87
Reduction of area; per cent.	T	2 8 8 2 10	52.7 63.7 66.8 62.1 65.0	66.1 64.2 68.9 63.0 66.2	56.3 67.8 69.9 56.8 67.9	53.6 67.2 69.6 60.0 68.8	62.8 67.6 60.T 58.2 50.5	66.0 68.0 61.0 66.1 60.0
	True av.	80	54.70	66.23	68.00	58.32	68.48	69.46